镀锌角钢理论重量怎么计算

6	镀锌角铁	∠100*10	吨			13.5根	9米/根
7	镀锌角铁	∠90*8	吨			5根	9米/根
8	镀锌角铁	∠80*8	吨			6根	6米/根
9	镀锌管	DN20	吨			17根	6米/根

镀锌等边角钢型号、公称尺寸、截面面积与理论重量型号    　尺  寸 mm 截面  面积理论重量外表面积bdr cm2kg/mm2/m　 14 　　　 140 　　10　27.37321.4880.551121432.51225.5220.55114　37.56729.4900.55016　42.53933.3930.549　 16 　　　 160 　　10　31.50224.7290.630121637.44129.3910.63014　43.29633.9870.62916　49.06738.5180.629  镀锌等边角钢型号、公称尺寸、截面面积与理论重量　 Designation 　　DimensionsSectional areaUnit massAtroot　　mmmmmmcm2kg/m    (1)(2)(3)(4)(5)(6)75x75x67568.58.7276.8575x75x8758911.48.9975x75x97598.512.699.9675x75x1275128.516.561380x80x68068.59.3277.3280x80x88081012.39.6380x80x1080101015.111.990x90x69061010.558.2890x90x79071012.229.5990x90x89081113.910.990x90x99091115.512.290x90x1090101017.0013.390x90x1390131021.7117.0100x100x710071013.6210.7100x100x810081215.512.2100x100x10100101019.0014.9100x100x12100121222.717.8100x100x13100131024.3119.1120x120x812081218.7614.7120x120x10120101323.218.2120x120x12120121327.521.6125x125x812581319.515.3125x125x10125101324.219.0125x125x12125121328.722.6130x130x913091222.7417.9130x130x12130121229.7623.4130x130x15130151236.7528.8150x150x10150101629.323.0150x150x12150121434.7727.3150x150x15150151442.7433.6150x150x19150191453.3841.9175x175x12175121540.5231.8175x175x15175151550.2139.4180x180x15180151852.140.9180x180x18180181861.948.6200x200x15200151757.7545.3200x200x16200161861.848.5200x200x2020020177659.7200x200x24200241890.671.1200x200x25200251793.7573.6250x250x252502524119.493.7250x250x282502818133104250x250x352503524162.6128

加6%锌层。